Find out whether Chrome console is open

Question

I am using this little script to find out whether Firebug is open:

if (window.console && window.console.firebug) {
    //is open
};

And it works well. Now I was searching for half an hour to find a way to detect whether Google Chrome's built-in web developer console is open, but I couldn't find any hint.

This:

if (window.console && window.console.chrome) {
    //is open
};

doesn't work.

EDIT:

So it seems that it is not possible to detect whether the Chrome console is open. But there is a "hack" that works, with some drawbacks:

• will not work when console is undocked
• will not work when console is open on page load

So, I am gonna choose Unsigned´s answer for now, but if some1 comes up with a brilliant idea, he is welcome to still answer and I change the selected answer! Thanks!

Answer 1

Chrome 65+ (2018)

r = /./
r.toString = function () {
    document.title = '1'
}
console.log('%c', r);

demo: https://jsbin.com/cecuzeb/edit?output (Update at 2018-03-16)

package: https://github.com/zswang/jdetects

---

When printing “Element” Chrome developer tools will get its id

var checkStatus;

var element = document.createElement('any');
element.__defineGetter__('id', function() {
    checkStatus = 'on';
});

setInterval(function() {
    checkStatus = 'off';
    console.log(element);
    console.clear();
}, 1000);

Another version (from comments)

var element = new Image();
Object.defineProperty(element, 'id', {
  get: function () {
    /* TODO */
    alert('囧');
  }
});
console.log('%cHello', element);

Print a regular variable：

var r = /./;
r.toString = function() {
  document.title = 'on';
};
console.log(r);